| Abstract |
| The concentrations of micropollutants―specifically microplastics (MPs) and natural organic matter (NOM)―in river water have increased in recent years. Current decentralized water treatment systems, consisting of coagulation-sedimentation, rapid sand filtration with or without granular activated carbon (GAC) filtration processes, are inefficient in reducing MPs and NOM. To assess the removal performance of GAC beds for these contaminants, both batch and continuous experiments were conducted to investigate the effects of GAC filtration on MPs and NOM in river water. The applied empty bed contact time (EBCT) ranged from 8 to 16 min. The results demonstrated that the GAC filter bed achieved high removal efficiency (> 70%) for NOM (DOC, 2-MIB, and geosmin), as well as substantial reduction of particulates (turbidity and MPs). The GAC bed exhibited higher efficiencies ( > 70%) than the SF bed in reducing particulates and NOM, which typically cause membrane biofouling and colloidal fouling. The headloss development rate of the GAC filter bed at an EBCT longer than 16 min was 2-3 times higher than that observed at an EBCT shorter than 10 min. This finding suggests that the combined filtration and adsorption processes in the GAC bed result in greater pore clogging due to the efficient removal of particulates and NOM. |
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| Key Words |
| EBCT, Granular activated filtration, microplastics, NOM, 공탑체류시간, 미세입자성물질, 입상활성탄, 천연유기물질 |
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